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575Volt 3-phase motor on 480 Volt 3-phase

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mike.mcnaughton

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Feb 12, 1999, 3:00:00 AM2/12/99
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Hello good People

I have a 100 hp 3-phase 575-volt motor and a 480-volt supply. The motor
is poart of a hydraulic system to be shipped to Canada.

I don't have a satisfactory transformer arrangement at the moment and
don't really want to buy one.

The quesiton is, can I run the 100 hp 575 volt motor on my 480-volt
supply for testing under derated load conditions (at say 60HP)? The MCC
control transformer can easily be changed to operate the starter during
this test.

It sounds allright to me but I have never tried it.

What do y'all think.

Thanks
MJMcN.


sam mayberry

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Feb 12, 1999, 3:00:00 AM2/12/99
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run it. sam

--

gyro, 400 bandit, v-max, helix, diesel powered bmw r100-rt.
VW diesel wabbit, dodge D-350 cummins.

Fred

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Feb 13, 1999, 3:00:00 AM2/13/99
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mike.mcnaughton <mike.mc...@sympatico.ca> wrote in article
<36C4E35...@sympatico.ca>...

> Hello good People
>
> I have a 100 hp 3-phase 575-volt motor and a 480-volt supply. The motor
> is poart of a hydraulic system to be shipped to Canada.
>
> I don't have a satisfactory transformer arrangement at the moment and
> don't really want to buy one.
>
> The quesiton is, can I run the 100 hp 575 volt motor on my 480-volt
> supply for testing under derated load conditions (at say 60HP)? The MCC
> control transformer can easily be changed to operate the starter during
> this test.
>
> It sounds allright to me but I have never tried it.
>
> What do y'all think.
>
> Thanks
> MJMcN.
>
You sure can.... You can bring it down to 75 HP safely... and if the motor
has a SF multipy 75 HP x the SF for the maximum HP you can run it at.

Fred G


John Coggins

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Feb 13, 1999, 3:00:00 AM2/13/99
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A 100HP 600V motor probably has a paper trail attached to it. Something like
a specification that includes a section on tests to be performed. Might want
to find out.

mike.mcnaughton wrote in message <36C4E35...@sympatico.ca>...

bmo...@telusplanet.net

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Feb 13, 1999, 3:00:00 AM2/13/99
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Current is to the square of the applied voltage.


stephen costello

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Feb 13, 1999, 3:00:00 AM2/13/99
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It should basically work - keep in mind the following:

1. Max load = approx 64%
2. Motor Torque drops to (460/575)squared per unit. (about 64%
3. Full load speed drops by 5-7%
4. % slip increases by 56%

Good luck. BTW 575v/480v transformers are standard products and can easily
be purchased (at least in Canada).

Steve Costello

John Coggins

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Feb 14, 1999, 3:00:00 AM2/14/99
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Regarding the transformers, have you considered an open delta 600/480
conversion using 2 relatively inexpensive single phase 480/240-120
transformers?
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